"Alles klar?" (You all right?) is like asking "Geht's dir gut?". When you just ask "Wie geht's dir?" (How are you?) you ask neutral, but asking "Alles klar?" you ask for the positive answer. You expect that the other is all right and will say "yes".
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Em1May 16 '12 at 10:13

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@Em1 I don't quite agree with "Alles klar?" asking for the positive answer. I would say this depends on who is asking whom, in what context, with what tone etc... Or I have been using it wrongly half of the time which is very possible of course...
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cgniederMay 22 '12 at 14:42

In the accepted answer "Danke, und selbst?" is mentioned. If I'm right I have also heard people using "Ja, und selber" is that right too or is that same. @Takkat please do edit.
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user1264624May 20 '12 at 9:27